wrote in message
I
have found that water pipes are tricky, specially those with
compression fittings. How tricky are the gas lines? Commen sense tells
me they are far more dangerous!

Do you see the shut off valve? If not, call a plumber or gas fitter, have
one installed. Next time it is a simple job to do.

Couple of correctly sized wrenches should have the tubing disconnected
easily. You need two wrenches. One to hold the fitting, the other to
loosen the nut.